/Engine/Source/Editor/SceneOutliner/Public/ISceneOutlinerMode.h
Called when a payload is dragged over an item
virtual [FReply](API\Runtime\SlateCore\Input\FReply) OnDragOverItem ( const [FDragDropEvent](API\Runtime\SlateCore\Input\FDragDropEvent) & Event, const [ISceneOutlinerTreeItem](API\Editor\SceneOutliner\ISceneOutlinerTreeItem) & Item ) const